“Take your camera to play photography” 09 camera metering mode, do you really know how to use it?

The perfect exposure of a photo is the key to photography. For a correct exposure picture, the overall tone of the picture image is moderate, the contrast between light and dark is appropriate, the color of the subject is accurately restored, the level details of the light and dark parts are rich, and the picture performance is normal. < / P > < p > maybe you think that the later stage of the digital era is omnipotent, so there is no need for accurate exposure like the film age. Anyway, as long as you store it in raw format, you can adjust it as you want! < / P > < p > this is actually a wrong concept, because photographic exposure involves the tolerance of the camera, so if you do not choose a good exposure spot, it may cause the lack of dark or bright details. The so-called tolerance refers to the span range from the lightest part to the darkest part of a scene. For example, there are seven light and shade levels for a landscape, from the brightest sky, the middle house and green plants to the darkest soil. The sensitive material with large tolerance can record the details of the sky and the details of the soil When the light sensitive material is small, many details will be lost in the high light and dark area, and the image taken often loses the texture. < / P > < p > the tolerance of digital cameras is generally 7 grades, that is, the upper and lower light points are 3 levels respectively. Scenes higher than the reference point of 3 levels or above will be seriously overexposed and dead white in the future. Scenes below this reference point will be seriously underexposed and will be dead black. Of course, this is a theoretical value. The specific tolerance can only be obtained by actual measurement. Generally speaking, there are three kinds of metering modes in digital cameras: one is the average photometry of eating a big pot, which is called by different manufacturers, Canon is called evaluation metering, and Nikon is called 3D matrix photometry. Although they are called different names, they are all the same. < / P > < p > evaluation metering mode is the default metering mode of the camera, which is to divide the picture into several areas, and then take an average value as the reference point for exposure. < / P > < p > the evaluation metering mode is most suitable for novice users, but it also needs skills to use it well. Because the built-in light meter of the camera belongs to the reflective light meter, and the reflective light meter belongs to the brightness measurement, and the reflectivity of the subject is one of the key factors affecting the brightness measurement. For more information about the reflectivity, you can refer to the following video: < / P > < p > for example, the green lotus leaf and the red lotus flower in the above picture have a reflection rate of 18% For objects, the exposure results obtained by using the average metering mode are just right. < / P > < p > but if it is a scene with great contrast, the exposure result may not be accurate. For example, in the following photo, most areas are in shadow state. If the evaluation photometry mode is used, the film will be inclined to the middle tone as a whole. Although the bark texture details will be more, it will lose the sense of historical precipitation, so this high contrast scene, Point metering mode is recommended. < / P > < p > just now we said that the evaluation of photometry mode is “eating a big pot of rice”. Then the spot metering mode belongs to eating “small stove”. Where the light measuring point is, the exposure value will be biased to the exposure value of intermediate tone. Video Number assistant internal test online! Four functions let you send 1g video on the computer